Don’t know exact size but I’m guessing it’s around a 10 21” pit to pit 21” length Warm on the inside to keep you going outside. Powered by seamless technology, this soft, sweat-wicking layer has a cozy interior to help keep you warm during chilly outdoor runs. skip-the-chafe, seamless construction Minimal seams to reduce chafe Sweat-wicking Four-way stretch Cozy and warm features Thumbholes keep your sleeves in place This fabric was treated with No-Stink Zinc™ to inhibit the growth of odour-causing bacteria